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KMID : 0362120140360020083
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Journal of Technologic Dentistry
2014 Volume.36 No. 2 p.83 ~ p.89
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Effect of modeling liquid on the shear-bond strength of zirconia core - porcelain veneer
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Choi Byung-Hwan
Kim Im-Sun
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Abstract
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Purpose: This study is to evaluate the effect of modeling liquid on the shear-bond strength between zirconia core and veneering ceramic.
Methods: Disk-shaped (diameter: 12.0㎜ ; height: 3.0㎜) zirconia were randomly divided into six groups according to the surface conditioning method and whether modeling liquid is used or not to be applied (N=60, n=10 per group): group 1 - control group with distilled water(ZD); group 2 - control group with modeling liquid(ZM); group 3 - airborne particle abrasion with 110-um Al2O3(AD)with distilled water; group 4 - airborne particle abrasion with 110- Al2O3 with modeling liquid(AM); group 5 - liner with distilled water(LD); group 6￡≠liner with modeling liquid(LM). Contact angles were determined by the sessile drop method at room temperature using a contact angle measurement apparatus. The specimens were prepared using dentin veneering ceramics, veneered, 3 high and 2.8 in diameter, over the cores. The shear bond strength test was performed in a Shear bond test machine. Load was applied at a cross-head speed of 0.50㎜ /min until failure. The fractured zirconia surfaces were evaluated by using stereomicroscope ( x 30). Collected data were analyzed using SPSS(Statistical Package for Social Sciences) Win 12.0 statistics program.
Results: ZD showed the highest contact angle(50.6 ± 5.4 ) and LD showed the lowest value(6.7 ± 1.3 ). Control groups and zirconia liner groups were significantly higher contact angle than liner groups(p<0.05). LD was the highest shear bond strength(43.9 ± 3.8 ) and ZD was the lowest shear bond strength(24.8 ± 4.9 ). Shear bond strengths of control groups and contact angle of liner groups were not significantly different((p>0.05). Liner groups presented adhesive failures. The others groups showed cohesive and adhesive failures.
Conclusion: Modeling liquid groups showed lower contact angles and lower shear bond strength compared to those of distilled water groups.
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KEYWORD
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